Ionia, Isabella, and Ottawa counties positive for HPAI in cattle

Three additional dairy herds in Michigan have been confirmed with highly pathogenic avian influenza.

State Veterinarian Dr. Nora Wineland tells Brownfield a lot is still unknown.

“I think because we see the highest amount of virus in the milk, the thought is that somehow the milk is involved in the transfer of the virus between cows and somehow also is involved in any transfers between farms,” she says.

The state on Friday confirmed herds in Ionia, Isabella, and Ottawa counties have tested positive for the disease, bringing the total number of herds impacted to four.

Michigan Department of Agriculture and Rural Development Director Tim Boring is urging farms to tighten biosecurity measures and limit nonessential travel between farms.

Wineland says the World Animal Health Organization has not changed their requirements on animal movements, but some states have varying restrictions.

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